I recently bought Samsung s21 FE, I am facing one issue with my device is that while calling I can spot 2 pixels becoming greenish yellow on display on the top right near the front camera and it stays like that during the whole call. But I don't see any of those pixels while normal usage even while watching movies it doesn't show those pixels. Only while calling I see those weird pixels. Is it a Software issue???? Do I need to visit the service center for this????